In the crystal structure of the title polymeric compound, [C42H38N6O33Sr5.2(H2O)]n, five independent metal atoms (Sr1–Sr5) have different coordination environments. The S 1 and Sr5 atoms are nine coordinated and feature distorted tricapped trigonal–prismatic and capped square–antiprismatic geometries, respectively. The rest SrII atoms have eight coordination numbers. These units are connected via the carboxylate O atoms of mono– and di anionic forms of pyridine– 2,6–dicarboxylic acid, (pydcH2), and bridging water molecules that resulted in the formation of polymeric layers in 3–D. In the crystal structure, non–covalent interactions consisting of hydrogen bonds (O—H···O and C—H···O), – [interplanar distances of 3.413(2); 3.601(2) Å] and CO··· [O··· distances of 3.249(3); 3.275(3) Å] stacking interactions play an important roles in stabilizing the structure. The protonation constants of propane–1, 2–diamine (1, 2–pn) and pyridine–2,6–dicarboxylate ion (pydc)2–, the equilibrium constants for the pydc–1,2–pn proton transfer system and the stoichiometry and stability of this system with Sr2+ ion in aqueous solution were investigated by potentiometric pH titrations. The stoichiometry of one of the most abundant complexed species in solution was found to be the same as that of the crystalline SrII complex.

Nano–sized titanium dioxide TiO2 powder was successfully prepared from its precursor titanium (IV) chloride by a simple and new wet chemical method. TiCl4 were used as precursor in hydrogen peroxide, H2O2 and ethanol. This solution was then peptized...

The first crystal structure of [Cu(terpy)2](PF6 )2 , where terpy=2,2:6,2–terpyridine is reported. Green crystals of [Cu(terpy)2](PF6 )2 were grown by ether diffusion into an acetonitrile solution of the complex. Crystal structure of this complex is...

The structure of N,N'–bis(2–hydroxybenzylidene)–2,2–dimethyl–1,3–propanediamine, C19H22N2O2, has been studied at low temperature (120K) by means of single–crystal X–ray diffraction. Solving the structure shows an orthorhombic unit cell, with P212121...